Self linked dictionary in Python

Advanced python dictionary(hash-table), which can link it-self keys and make calculations into the keys of the dict
Installation
Use the package manager pip to install foobar.
Usage
The syntax of expressions:
{'key' : '...$(expression)$...'}
Initialization:
from HyperDict import HyperDict
from json import dumps
dictionary = HyperDict({}) # {} - your dict